By BILL BARROW and MICHELLE L. PRICE MILWAUKEE — The Republican National Convention celebrated former President Donald Trump not just as a party leader but a living martyr who survived a would-be assassin’s bullet and is ready to work for everyday Americans after a sweeping victory in November. The portrayals of unity, including in Trump’s first speech since he was injured in the assassination attempt last Saturday, sought to erase the image of a man whose presidency often swirled in chaos and infighting and ended with a violent insurrection at the U.S.